Displaying 1 result from an estimated 1 matches for "alphabeta".
Did you mean:
alphabet
2006 May 11
1
about MCMC pack
...MCMC pack, particularly the function MCMCirtKd to
simulate the posterior distribution in a multidimensional IRT model.
The code I used is:
posterior1 <- MCMCirtKd(Y, dimensions=2,
item.constraints=list("V2"=list(3,0)),
burnin = 1000, mcmc = 10000, thin=1, verbose = 1, seed = NA,
alphabeta.start = NA, b0 = 0, B0=0, store.item = FALSE,
store.ability=FALSE, drop.constant.items=TRUE)
where Y is a matrix subjects x items (1500 x 32) of simulated response
sequences.
After running the program, if I ask for a plot or summary of the MCMC
object "posterior1", I obtain this m...